Often a reading can be wrong. This patch assures that this is really a
pen up event and not a false reading.
Based on wm9712: pen up by Teresa Gámez and Christian Hemp.
Cc: Teresa Gámez <t.gamez@xxxxxxxxx>
Cc: Christian Hemp <c.hemp@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
Acked-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
drivers/input/touchscreen/wm9712.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/input/touchscreen/wm9712.c b/drivers/input/touchscreen/wm9712.c
index a983da1..3b4eed4 100644
--- a/drivers/input/touchscreen/wm9712.c
+++ b/drivers/input/touchscreen/wm9712.c
@@ -302,8 +302,12 @@ static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
}
if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
- wm->pen_probably_down = 0;
- return RC_PENUP;
+ /* Sometimes it reads a wrong value the first time. */
+ *sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
+ if (!(*sample & WM97XX_PEN_DOWN)) {
+ wm->pen_probably_down = 0;
+ return RC_PENUP;
+ }
}
return RC_VALID;
--
1.8.1.5
--
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